package collection;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class SortPoint {
    public static void main(String[] args) {
        List<Point> list = new ArrayList<>();
        list.add(new Point(3,4));
        list.add(new Point(1,2));
        list.add(new Point(0,1));
        list.add(new Point(5,6));
        System.out.println("原始数据："+list);


        Collections.sort(list, new Comparator<Point>() {
            @Override
            public int compare(Point o1, Point o2) {
                int len1 = o1.getX()*o1.getX()+o1.getY()*o1.getY();
                int len2 = o2.getX()*o2.getX()+o2.getY()*o2.getY();
                return len1-len2;//升序
                //return len2-len1;//降序
                //return o2.getX()-o1.getX();//比较x
            }
        });
        System.out.println("排序后："+list);
    }
}
